geometry vocab

Question 1

location with no size or shape

Answer 1

point

Question 2

made up of points with no thickness or width

Answer 2

line

Question 3

a measurable part of a line consisting of two endpoints

Answer 3

line segment

Question 4

a line that extends indefinitely in one direction

Answer 4

ray

Question 5

a flat surface made up of points and extends indefinitely in all directions

Answer 5

plane

Question 6

points that lie on the same line

Answer 6

collinear

Question 7

points that lie on the same plane

Answer 7

coplanar

Question 8

segments that have the same length

Answer 8

congruent segments

Question 9

if a, b, and c are collinear points and b is between a and c, then line ab + line bc=ac

Answer 9

segment addition postulate

Question 10

the formula used to find the midpoint between 2 endpoints

Answer 10

midpoint formula

Question 11

the formula used to find the distance between 2 points of a coordinate plane

Answer 11

distance formula

Question 12

a segment, line, or plane that intersects a segment at its midpoint

Answer 12

segment bisector

Question 13

two lines that intersect at a 90 degree angle

Answer 13

perpendicular

Question 14

A line segment or ray perpendicular to a segment at its midpoint

Answer 14

Perpendicular bisector

Question 15

two lines that never intersect

Answer 15

Parallel lines

Question 16

The intersection of two rays at an endpoint

Answer 16

Angle

Question 17

The common endpoint of an angle, where the sides intersect

Answer 17

Vertex

Question 18

an angle with a degree measure of 90°

Answer 18

Right angle

Question 19

an angle with a degree measure of less than 90°

Answer 19

acute angle

Question 20

An angle with a degree measure of greater than 90°

Answer 20

Obtuse angle

Question 21

An angle with a degree measure greater than 90°

Answer 21

Obtuse angle

Question 22

an angle with a degree measure of 180 degrees

Answer 22

Straight angle

Question 23

two angles that have the same measure

Answer 23

Congruent angles

Question 24

two angles that share a common side in vertex

Answer 24

Adjacent angles

Question 25

if ABD and DBC are adjacent then ABD plus DBC equals ABC

Answer 25

Angle addition, postulate

Question 26

A line or ray that divides an angle into two equal parts

Answer 26

Angle bisector

Question 27

two angles directly across from each other on intersecting lines, always congruent

Answer 27

Vertical angles

Question 28

Two angles with measures that sum to 90° they do not have to be adjacent

Answer 28

Complementary angles

Question 29

two angles with measures that sum to 180° they do not have to be adjacent

Answer 29

Supplementary angles

Question 30

Adjacent angles that are supplementary. Combined, they form a straight line.

Answer 30

linear pair